About Installing an ICSU Module

DEFINITY Made Easy Tools
Issue 2, November 2000

Add Channel Service Units

About Installing an ICSU Module

The integrated channel service unit (ICSU) is a combination of a 120A CSU module integrated with a DS1 circuit pack. Use this device with the 700A DS1 loopback jack when testing the DS1 span.

See Installing the 120A CSU for step-by-step installation procedures for the 120A CSU.

Check for required components

The ICSU package contains:

120A CSU module

Cable H600-383

4-pair modular cord
Group 2, 50-foot (15.2 m) cable (standard)

Cord DW8A-DE

4-pair modular cord to alarm contacts

DS1 circuit pack

The basic ICSU requires a TN464E or TN767D or later suffix. The enhanced ICSU requires a TN464F or TN767E or later suffix.

H600-383-Equivalent Cable Guidelines

If using cabling other than the H600-383 provided with the 120A, observe the following guidelines:

Use 24-gauge wire that provides individually shielded, twisted pairs for transmit and receive signals. Use the cable between the network interface and the 120A. Ground the shields of this cable only at the 120A end to avoid ground loops.

Cabling between the network interface and 120A can have no bridge taps.

If using standard house riser cable for connections between the network interface and the 120A, maintain a 100-pair separation between the receive and transmit twisted pairs.

If using standard house riser cable for connections between the network interface and the 120A, allow no more than 2 cross connects to 110-type cross connect blocks.

Never use quad cable (untwisted two pair telephone cable) in a DS1 line.

Avoid mixing wires of different gauges in a DS1 line.

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